Lady Day - The Feast of the Annunciation, March 25Midsummer Day - The Feast of St. John the Baptist, June 24Michaelmas - The Feast of St. Michael and All Angels, September 29Christmas Day - The Feast of the Nativity, December 25

The tax year used to end of 25 March - Lady Day.

The timing of the tax year has its origin in the switch from the old Julian calendar to the more accurate Gregorian calendar in September 1752. At the time of the change it was calculated that the Julian calendar had lost 11 days since its introduction in 46 BC. To catch up those 11 days, 2 September was followed by 14 September. Rather than lose 11 days' tax revenue in that tax year, the authorities tacked the missing days on at the end, which meant moving the beginning of the tax year from 25 March, Lady Day, to 6 April.